[Gluster-users] Regarding Replicated Volume

[Paul Robert Marino]

On Wed, Mar 19, 2014 at 9:42 PM, Viktor Villafuerte
<viktor.villafuerte at optusnet.com.au> wrote:
> I'm fairly confident that the docs are talking about this:
>
> 1) it's not recommended to have replicated bricks accross long distances
> (am not from US so I don't know the exact distance between Seattle and
> Chapel Hill, but it sounds far haha)

They are on opposite sides of the continent,  so yea thats far lol.

> 2) would geo-replication be the way to go?
>
> Anybody correct me if this is not so!
> ..maybe give the docs one more go?
>
> v
>
>
> On Wed 19 Mar 2014 12:06:37, Cary Tsai wrote:
>> Hi There:
>> New to the GlusterFS and could not find the answer from the document
>> so hope I can get the answer form the mailing list.
>>
>> Let's say we have two web servers:
>> One in Seattle, WA and another one is in Chapel Hill, NC.
>> So I create a 'replicated' volume which one brick in WA and another brick
>> in NC.
>> I assume the web server in both WA and NC can mount the 'replicated' volume.
>> There are 2 HTTP/Get calls from CA and NY.
>> We assume CA's HTTP/Get is sent to web server in WA and
>> NY's HTTP/Get is sent to web server in NC.

No its round robin and you cant control it because it assumes all your
bricks are in the same data center.
further more writes get sent to both from the client.
The scenario you described is not what it was designed for.
If you can live with this volume as a readonly on the webservers  in
the sedond site geo-replication is your best bet.
If you need the web servers to be able to write in both sites then you
should buy a really good wan optimizer because I don't know of any
clustered file system or NAS which would do that efficiently.




>>
>> My question is does the web server in WA definitely gets the data
>> from the brick in WA? If not, is any way to configure so the
>> web server in WA definitely gets data from the brick in WA?
>>
>> Thanks
>
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>
>
> --
> Regards
>
> Viktor Villafuerte
> Optus Internet Engineering
> t: 02 808-25265
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